Nut-lock.



No. 845,250. PATENTED FEB. 26, 1907.

E. M. NEWMAN.

NUT LOCK.

APPLICATION FILED MAR. e, 1906.

posite sides of the UNITED STATES PIgTENT OFFICE.

EVALYN M. NEWMAN, or EVANSTON, ILLINOIS, ASSIGNOR TO HELEN LEE WARD, or OAK PARK, ILLINOIS.

NUT-LOCK.

' Specification of Letters Patent.

Patented Feb. 26, 1907.

Application filed March 6, 1906. Serial No. 304,507.

To (all Iuhbm, it may concern:

Be it known that I, EvALYN M. NEWMAX, a citizen of the United States, residing in ,Evanston', in the county of Cook and the State 'of Illinois, have invented certain new and useful Improvements in Nut-Locks, of

which the following is a specification.

This invention relates to that class of nutlocks provided with bearing edges upon opaxial center of the locking member and having concave or recessed surface portions between such bearing edges adapted to admit the chamfered face of a primary nut. I

The principal object of the invention is to provide a simple, economical, and efficient nut-lock.

The ordinary primary nuts of commerce which are commonly used are chamfered,

and it isdesirable to provide a nut-lock.

- adapted to be efficiently used in connection 'without depending up on primar with such chamfered primary nuts. I have found that when a nut-lock is securely held in non-rotatable relation to a primary nut by means of sharp retaining edges in engagement with the primary nuton opposite sides of its axial center, as hereinafter described,

the nut-lock and primary nut each having one or more complete spiral threads may be caused to engage the threads of the bolt with such firmness as to eflicientlyhold all three members-the primary nut, nut-lock, and bolt -in non-rotatable relation to each other the distortion of the threads of the locking member. In other words, the tightening of a nut-lock constructed ashereinafter described upon a primary nut will not only hold the nut-lock and nutin' fixed relation to each other, but wil produce a binding effect or frictional engagement between the threads of these members and the cient to efiiciently hold all three members in non-rotatable relation to each other.

One of the principal objects of the, invention,therefore,is to provide suitable means for holding the primary nut against accidental rotation with relation to the boltin such a manner as to avoid the distortion of the "threads of the locking member or nut-lock. I

My improved nut-lock does not depend upon the binding engagement between the threads of the nut or nut-lock and bolt prothreads. of the bolt suffibiting retaining edges duced by distortion for holding the parts nonrotatably. On the contrary, it depends primarily upon the engagement of the sharp impinging or biting edges of the nut-lock with the surface of the primary nut against which such sharp impinging edges are forced so tightly and unyieldingly as to hold the parts in fixed relation without depending upon the distortion of the threads of the nutlock or the body portion thereof.

One of the objects of the invention, therefore, is to provide a nut-lock having sharp impinging edges on opposite sides of its axial center in engagement with the adjacent surfaces of the primary nut and adapted to hold such members in fixed relation-withoutdistort-ion and consequent weakening of the mitlock or locking member.

Other. and further objects of the invention will appear from an examination ofthe drawings and the following description of the claims.

The invention consists in a nut-lock provided with sharp biting or impinging edges 1 on opposite sides of its axial center having a I concave or recessed portion therebet'ween, both of such edges being normally in the same plane at right angles to the axial center of the nut-lock and in position to engage and exert a substantially uniform pressure upon opposite sides of a primary nut and prevent the rotation thereof. 3

It consists, further and finally, in the feat'ures, combinations, and details of construction hereinafter described and claimed. i

In the accompanying drax ings, Figured is a perspective view of a nut-lock constructed in accordance with my improvements; Fig.2, a sectional view in elevation showing the nut lock and primary nut member in operative position upon a bolt; andFig. 3, a viewin elevation of a modified form of nut-lock lock flat at the center.

, .9 52 showing the side surface portions of the nut- In constructing a nut-lock in accordance with my improvements I rovide amctallic nut-lock (1, having straig t parallel sharpon opposite sides of its axial/center and provided with hollow re- I cessed or concave surface portions or side faces a between such impinging orbearing edges on both the top and .ottonr sides yollthjeggi nut-lock. The side faces off' my preferred form of nut-lock, as shown in Fig. are thus both coneave or hollow throughout, and the retaining edges extend along opposite sides of each of such concave or hollow faces on a plane at right angles to the axial center of the nut and in position to be moved substana surface portions (1 of the nut-lock member ex tend directly away from the biting retaining edges at an abrupt angle.tothe concave side faces, with which they converge at each of such edges. The edges are therefore sharp and adapted to bite into the surface of the primary nut, so as to retain it in its proper position and securely hold it against rotation. -The nut-lock thus formed is of suiticient thickness and of such material as to re- 7 main substantiallyrigidwhen in operative position andijs provided with an axial perforation extending therethrough at right angles to thei'base. formed by the retaining hearing' which are inthe same plane and engagethe primary nut to be held against rotation thereby. This. axial perforation is provided with uniform substantially rigid spiral screw-threads e in threaded engagejnent with the threads-J of the headed bolt g,

'upon Whichsuch lock ismounted. A prinuth is also provided having a threaded axialperforation through which the bolt extends. The concave or hollow faceof the nut-lock isadapte'd to admit the chamfered face 'i'of the primary nut, so as to enable the ,shaip impingingbiting edges of the nut-lock the parts in fixed relation to eachother. The retaining .edges of each side of the nut-lock, :as already suggested, extend in parallel relato engage the primary nut and firmly retain tionto each other and are normally in the sameplane at right angles to the axial center of the-nut-lock. The spiral threads of the locking member are at an incline with relation to the retaining edges, and the cham- .fered prin'iary nut provides inclined Wedge- .like surface portions on opposite sides of the axial center of the nut, which extend at a different incline from that of the spiral threads. The rotation of the nut-lock in the proper direction not only tightens it upon the pri:

mary nut,"by reason of the engagement of the retaining edges with the face of the nut, but

also causes the threads of both the nut and nut-lock to tightly bind against or to frictionally engage the: threads of the bolt. This binding engagement is so firm as to efficiently prevent all three members-the nut-lock,

'. primary nut, and boltfrom rotatin with relation to each other, except upon t e aplication of,force applied for the purpose of lbosening them by" rotation. The nut-lock resisting the strains to which t thus aids the primary nut in resisting the strains to which it is subjected .in use. The

cutting edges exert a substantially equal pressure upon the opposite sides of the axial center of the primary nut and are each in'biting engagement, so as to retain the primary nut in proper position and hold it against rotation. n

In operation the strains to which the primary nut is subjected tend to press it toward the nutlock. The binding effect .between the threads of the nut-lock and bolt is thus increased. So also is the biting engagement bet-ween the retaining edges and the primary nut. The nut-lock'rnay thus be caused to be tighter than the primaryvnut upon the bolt,

and security against becoming loosened by accident is thus insured. The concave or hollow surface portions or-recesses preferably extend from one to the other of the retainin edges 6 or inner faces j of the nut-lock an are out of engagement with the chamfered face of the prlmary nut when the parts are in o erative position. By this arrangement t e convex or chamfered portionof a rimary nut will extend into the hollow side ace of the nut-lock, or, in other Words, into the recess between the sharp retaining edges of the nut-lock, so as to permit the proper engagement of the parts when a chamiered nut is used.

A nut-lock is thus provided having sharp arallel biting retaining edges adapted to be brought substantially simultaneously into engagement with the adjacent surfaces of the primary nut, so as to exerta uniform and equal pressure on opposite sides of its axis. The primary nut is held against rotation by the action of the biting retaining edges of the nut-lock and the frictional engagement with the threads of the bolt and does not depend upon the distortion or straining of the nutlock member or its threads for retaining it in proper position. The nut-lock member is not required to be held under a constant strain in order to prevent the rotation of the primary nut or bolt, nor are the threads required to be distorted for such purpose, all of which would tend to Weaken the parts. The nut-lock member is made as rigid or unyielding as possible, and its threads are continuous, of uniform strength, and as rigid as its body portion, so that when the nut-lock member and the primary nut are constructed and used togetherm the'manner described the rigid nutlock member supplements the 1primary nut in e latter is subjcctedin use. The resisting strength of both is much greater than when a flexible or distorted nut-lock member is required to be under constant strain. Furthermore, the efficiency of the nut-lock in preventing rotation of the parts is increased by reason ofits rigid- .ity and the constant unyielding quality of the sharp retaining edges, which may be forced into secure biting engagement withl therebetween.

2. A rigid nut-lock provided with a circular axial perforation having a spiral thread extending entirely around such perforation. and provided with a concave side face. and sharp retaining edges extending along oppo site sides of such concave side face, both of such retaining edges being normally in the same plane at right angles to and on opposite sides of the axial center of the nut-lock.

3. A nut-lock provided with an axial perforation having a spiral thread extending en tirely around such perforation and adapted to entirely encircle a bolt, such nut-lock having opposite hollow side faces, and having sharp biting retaining edges extending along opposite sides of each of such hollow side faces, both of such retaining edges for each face being normally in the same plane at right angles to and on opposite sides of the axial center of the nut-lock.

4. The combination of a nut-lock pro vided with a circular axial perforation having one or more complete spiral threads, and

l 0 having snarp retaining edges, such retainirig ed es being normally in the same plane at rig it angles to and on op Josite'sides of the axial center of the nut-loo and having a recess therebetween, a bolt upon which such nut-lock is mounted, and a primary 'ni t mounted upon such bolt in engagement with the sharp retaining edges of such nut-lock.

5. The combination of a nut-lock p1 vided with a threaded axial perforation an opposite concave laces, each face having sharp projecting retaining edges extending along opposite sides thereof-normally on a plane at right angles to the axis of the nutlock, a threaded bolt upon which such nutlock is mounted, and a nut in engagement 'with the fitljilCQIlt sharp retaining edges of the nut-lock.

6. The combination of a nut-lock provided with a spirally-threaded axial perforation and having sharp retaining edges on opposite sides of such axial perforation, and a recess between such edges, a threaded bolt upon' which such nut-lock is mounted. and a primary nut mounted in threaded engagement with such bolt, and having convex chamfered portions extending into the recess between the retaining edges of such nut-lock and engaged by such retaining edges.

EVALYN M. NEWMAN.

Witnesses:

I'IARRY Inwrx CROMER, S. R. \YOLFE. 

